Labels:book | crt screen | poster | reckoner | sky OCR: Lesson 16 Building turtle graphics program Now we can look at a graphics program, called Turtle It defines number of complex graphics curves and way you'fi be able to create mini-I Logo language out of several definitions in the program We'll have the first involv ement with Macintosh parameters and Toolbox calls Turtle Graph: ics Objects for Demo need sin dec- imal Class PEN defines turtle- -graph: ics :class PEN super{ object LC record{ These first ivars compr: ise PenState structure point PnLoc locat .on of pen point PnSi ze width height int PnMode var PnPa Lo var PnPatHi bue LG Direct: .on point home Loc 20 int maxReps 21 int initLen 22 int deltaLen change 1 len 23 int deltaDeg change angle 24 2 5 GET ^base call GetPenSt tate Save state here SET: ^base call SetPenS cate Restore from he ...
